The Shop-Vac Hang-Up 3.5-Gallon Disposable Filter Bags have been engineered to fit and work in conjunction with the Shop-Vac Hang-Up Vacuum, providing effective motor protection for one of the companys most convenient models. This pack contains 3 bags, each with a special filter lining that brings an increased fine-particle filtration to the Hang-Ups dirt storage. Easily disposable and easy to install, these bags are designed for dry pickup only.